The Sperone Westwater Gallery blames a sculptor next door for a stinky turd it found on its terrace during a bitter property-line dispute over 4.8 inches.

“The fact that the final resting place of that object was south of its point of impact made clear that it had been thrown from the north, that is, 259 Bowery,” the gallery alleges in a Manhattan Supreme Court lawsuit. “At the time the fecal matter was discovered, the Gallery was open to the public.”

Charles Saulson, 59, a sculptor, developed and owns the six-story condo at 259 Bowery.

Saulson has been feuding with the adjacent eight-story gallery since the $20 million art house, which has a strip of black rubber butting up against Saulson’s building, was erected two years ago.

British architect Norman Foster designed the home for the gallery, which opened last September.

The building is wrapped in black aluminum to protect the works inside from water, heat and humidity.

Earlier this month, gallery manager Brian Dooley found the sheeting had been torn from the rear corner of the structure next to Saulson’s condos.

At one point, Dooley discovered some of the aluminum “sawed back” and two-by-fours shoved into the gap, court papers say.

Sperone wants a judge to bar Saulson from even touching the art gallery.

Saulson “has demonstrated a propensity of resorting to self-help, in unpredictable ways, which no money damages can prevent or alleviate,” the suit states.

Saulson, of the Upper East Side, told The Post, “They’re 4.8 inches on my property. There’s a leak in the basement.”